Question

I have a file with random data for accounts.
The data in the file:

5

2871 2.19 8

1234 95.04 23

3341 0.00 10

3221 -1.08 21

7462 404.14 4

3425 4784.00 200

3701 99.50

JUNK SHOULD NEVER GET HERE

3333

The first number 5 will always be the number of accounts that need to be processed.
I want to be able to read that number and set it as the number of accounts.

So my question is how can I read the file and read line by line and set the first number to the number of accounts that need to be processed.

Code so far:

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main() 
{

    double NumberOfAccounts;

    ifstream File("test.dat");
    string line;

    if(File)
    {
        while(getline(File,line))
        {
            NumberOfAccounts=line[0];
        }

    File.close();
    }

    cout<<NumberOfAccounts;

    system("pause");

    return 0;
}

Right now it just prints out 51.

Any tips/help would be appreciated.

Answer 1

NumberOfAccpounts is double, you are assigning the first character of line…
I assume you menat the first line in the file.

My C++ is crap so

pseudocode

if(File)
{
  if getLine(File, line)
  {
    NumberOfAccounts =atof(line);
  }
  File.close();
}
cout<<NumberOfAccounts;
system("pause");
return 0;

atof is one way to convert a string to a double. You don’t need to read the entire file to get the first line.